A386158 Primes having only {2, 4, 7, 9} as digits.

2, 7, 29, 47, 79, 97, 227, 229, 277, 449, 479, 499, 727, 797, 929, 947, 977, 997, 2297, 2447, 2477, 2729, 2749, 2777, 2797, 2927, 2999, 4229, 4297, 4447, 4729, 4799, 4999, 7229, 7247, 7297, 7477, 7499, 7727, 7927, 7949, 9227, 9277, 9479, 9497, 9749, 9929, 9949

Offset: 1

Author

Jason Bard, Jul 18 2025

Keywords

• nonn
• base
• easy

Links

• Jason Bard, Table of n, a(n) for n = 1..10000
• Index to entries for primes with digits in a given set

Crossrefs

Supersequence of A261182, A261183, A385784, A385785.

Cf. A000040, A385776.

Programs

Magma

[p: p in PrimesUpTo(10^6) | Set(Intseq(p)) subset [2, 4, 7, 9]];

Mathematica

Flatten[Table[Select[FromDigits /@ Tuples[{2, 4, 7, 9}, n], PrimeQ], {n, 7}]]

PARI

primes_with(, 1, [2, 4, 7, 9]) \\ uses function in A385776

Python

print(list(islice(primes_with("2479"), 41))) # uses function/imports in A385776